Tech Staff Meeting Notes September 24, 2012

The top priority is always repair of down stations.
NM problem stations
ET problem stations

Duty Table updated May 2012


News & Highlights

The fishing trip is scheduled for Oct 18-19.

Middle TN Station

The first telemetry test at Cedars of Lebanon was unsuccessful. It may be quiet enough closer to the park headquarters so that we can hard-wire it. Chris will drop a 6TD to find out.


Short Period & Broadbands

EDIT, NNAR & CHNM: NNAR and CHNM will be redirected to transmit directly to the node instead of through EDIT.


Unk Problem
HCAR.EHN (image)
CATM.EHE (image)
BETM.EHN (image)
LRAR.EHE - muted amplitude (image)

Isis Oxidation

Strong Motion Problems
MKAR- down

Arkansas network problems
WLAR - still dropping out
WLAR - strong motion station down

Mag. 4.0 gain range problems
These stations had problems with the gain channel during the Magnituded 4 Missouri event on Feb 21, 2012. It isn't clear to me whether they data channels saturated or whether there was excessive chatter in the gain channel. See image.

Jim thinks long period drift on GNAR horizontals could be differential heating and cooling of the vault. This site floods so everything is raised and the vault extends above the surface. An earthen berm was mounded about the top but as since subsided and eroded leaving part of it exposed. Need to rebuild the berm.

NODE Tasks




Jim is getting a quote to replace the muffler, exhaust manifold, and vaporizor solenoid.

Mitch needs to modify env_alarm to monitor the ACFA channel. It is no longer a simple binary on/off voltage but rather contains pulses that indicate the status of the 3-phase AC power input.


G and D and the local EMA installed a 25kW generator to power that side of the building. If there's room power-wise would they let us power the rack from it too? We could share the maintenance of the generator. We'd also have to install a transfer switch.



Twisted pair from Richardson is extremely noisy causing problems with the analog backbone. Richardson is also on the UM 5-year capital improvement plan to be replaced. We got a tour of Wilder and its doable. We need to see if we can get a path to CERI so we know whether we just need to move what's on Richardson now, or whether we need to turn Wilder into an entirely new node (i.e. new mudworm). Then we can get Planning to help us with a design and then we can get permission.
We could just move the firewall from 3904/218 to Wilder and get the DBB on the campus internet that way (if there's no aironet line of site). There are good telephone pairs from from the Wilder roof to the basement and we could move the ceri node/mudworm to the basement. Otherwise we'd have to find and trust connections between the basement and CERI.

We have line of site from the southeast corner of 3904 except there are powerlines in the way. Can we put up a tower on the east side of 3904 to get over the trees and power lines on central?

Another possiblity is the old WKNO tower on south campus. Pat mentioned that Russ Abernathy may allow access to their tower. Mitch will follow up with Pat and find out the current and planned building use.


Ownership, Operation, and Maintenance of the four Charleston, SC stations (C1SC, C2SC, ADSC, and TRSC) was turned over the Univ. of SC at Columbia. At Phillip's request, we letting the data flow through CERI for the time being. Eventually it will get switched to Columbia and the network codes will then change from NM to CO. Mitch will check into converting to the CO network code at CERI.

MCAR is the only remaining station coming in via gcf2ew on anssworm. MCAR loses its connection a half dozen or so times per day.

Replace foam rubber plugs at all year 1 stations (need to notch it to accomodate the GPS pods): ASAR, CBHT, CUET, MCAR, SFTN.

NAIT: Is now online and got a yr3 upgrade.

CVVA. There is a new IT person at the DMME which may help break the logjam.

We need a single document (access database excel spreadsheet) to document information on all freefield strongmotion stations to include contact(s), current IP's(eternal/external), what ports are allowed in from what IP's here at CERI, telnet yes or no, trigger levels etc. etc.





Multi-station image

BCRT- interference -spikes - both SM and BB.
GRBT.EHN - GRBT.EHN trace has the same order of magnitude amplitude traces as the N and Z (all +- about 100 counts). But GRBT.EHN is still sick. Note the positive and negative spikes and the lack of microseisms seen on the other channels. The sensor was replaced on 9/20 but the problem still exists in the event recorded on 9/25

CCNC- spikes
CPRT- spikes -SM only
MGNC- spikes
CSTN - gaps
RBNC- spikes
SMNC- gain channel problem
TVNC- gain channel problem
WSNC- unusable

*Strong Motion down*


Generator is not functional despite EMA's effort to repair. Consider additional battery for starworm.

BHT move. We may need a written MOU with the Catoosa WMA so John gave them the one we did with TDEC as an example. New site on Pilot Knob Mtn. is about about 9 miles to the E NE. The new location does not have a path to Star Mountain but we do now have hardware for the digital upgrade (a Basalt). John obtained permission to install a repeater at the sheriff's office in Wartburg. Was this where we get internet?


Reinstall battery backup.

Central Receive: Still have interference from the ham operator. John has an application to for a complaint to FCC that he needs to complete and submit.

WSNC: Fixed transmitter but had to pull the sensor to repair the E-W channel.

MTTN Node ASTN: Change to AC power. We have permission and can install anytime.


PIGT out -- network provider issues

NMKM out -- problem unknown, will try to visit this week.

Just out Friday? By GAMA Page PTGV &PTGX David just power cycled WAP in the office end week before last to bring them back. If you select PGTX or PTGV you can reach the rcvr. So I am guessing they are not out. Maybe the last time they were not out also?

We need a better plan for end-to-end O&M of the GPS network in the post JPD era.

I40 Bridge Upgrade

Granites are on a 192 network. Worm is running. Ready to install.

AG Network

WLAR has large latencies and poor internet connection. Something odd is also going on with the Reftek and it may be losing power or cycling. Works fine with no outages when the reftek is operating at the VC connected directly to the router. So the problem must be between the station and the router.


Chris is looking for suitable bags to protect CMG6TDs during burial. First experiment with a bag under water failed.

What equipment in the FDL is no longer needed. Mitch will call a meeting of FDL users to discuss culling the equipment. Also, the check out/in process is largely ignored--what system could be implemented that people will actually use. Jer Ming is having trouble with some of the old equipment.

We have one bad CMG-6 Should it go Guralp for repair? Who pays for it?


NSMP Station List.


New door locking scheme got delayed.

The seisnet group on umdrive is at You will need your uuid and password.